Authors
Danuta Strahl
Wrocław University of Economics, Faculty of Economy, Management and Tourism, Jelenia Góra, Poland
Roman Sobczak
Wrocław University of Economics, Faculty of Economy, Management and Tourism, Jelenia Góra, Poland
© 2017 Danuta Strahl, Roman Sobczak, published by Jan Evangelista Purkyně University in Ústí nad Labem
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.